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x in (-oo:+oo)
3*x-((8*x^1)/2) = x+2 // - x+2
3*x-((8*x^1)/2)-x-2 = 0
3*x-4*x-x-2 = 0
-2*x-2 = 0 // + 2
-2*x = 2 // : -2
x = 2/(-2)
x = -1
x = -1
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